iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dm snapshot: use barrier when writing exception store

Browse Source 
Send barrier requests when updating the exception area.

Exception area updates need to be ordered w.r.t. data writes, so that
the writes are not reordered in hardware disk cache.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-06-22 10:12:26 +01:00 committed by Alasdair G Kergon
parent 51aa322849
commit 2bd0234525
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/dm-snap-persistent.c
View File

@ -636,7 +636,7 @@ static void persistent_commit_exception(struct dm_exception_store *store,
/*
* Commit exceptions to disk.
*/
if (ps->valid && area_io(ps, WRITE))
if (ps->valid && area_io(ps, WRITE_BARRIER))
ps->valid = 0;
/*